<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Jsdemo</title>
    <script type="text/javascript" src="jsdemo.js">

    </script>
</head>
<body onload="ymd()">
     <form >
        <select name="yyyy" id="yyyy"></select>年
        <select name="mm" id="mm" onchange="selectYmd()"></select>月
        <select name="dd" id="dd"></select>日
        <input type="button" value="删除列表框条目" onclick="deleteSelect()">
        <img src="01.png" alt="" id="logoImg">
        <select name="" id="logo" onchange="selectLogo()"></select>
     </form>
</body>
</html>